SAN FRANCISCO (CBS SF) — CHP in San Francisco on Wednesday afternoon reported that the northbound US-101 connector ramp has reopened after being closed by police activity.

Shortly before 1 p.m., CHP issued a severe traffic alert due to police department activity blocking all lanes of the northbound US-101 connector ramp to US-101.

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At about 1:20 p.m., the Twitter account posted that all lanes had reopened.

There were no details available regarding what the police activity that forced the closure was.

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Motorists are advised to expect residual delays and to use alternate routes to avoid the area.